There is more to the work of Walter Sickert than current deluded conspiracy theories, as an exhibition at Tate Britain shows.

There is more to the work of Walter Sickert than current deluded conspiracy theories, as an exhibition at Tate Britain shows.
The headline-grabbing ‘improvements’ to an Anna Leporskaya painting by a security guard are as valid a critique and reconstruction as anything from the mainstream art world.